Purifying composition for counteracting the formation of scale in boilers



Patented May 16, 1927.

umrlzn srA'Tss PATENT ormcs.

IIAH8 LIL LIJORD, F TBONDEJEH, IQBWAY, ABSIGNOB '10 A/S 'NOBSK mum- INSNINGSIIDDEL IDEAL, 01' KIBKEGATEN, OSLO, NORWAY.

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Io Drawing.

At present many different substances, 'compositions and mixtures are used with a view to prevent or counteract the formation of scale in boilers. In the most'cases the prin- 5 cipal constituent is calcined soda alone or caustic soda and calcined soda, and sometimes also lime is used. These substances have the effect of recipitating in the water the dissolved sal ts of calcium and magnesium. In

combination with the said precipitating substances also ditferent other substances are used, and the latter have for their purpose essentiall to prevent the separated substances form sett ing upon the boiler pipes or upon the heating surfaces of the boiler. Among substances of this sort wood-dust, starch, organic arseno compounds, etc., have been proposed.

In all combinations of mixed constituents hitherto used as a boiler purifying composition certainly the most part of the dissolved substances are precipitated, but the same 'were not fully prevented from settling as scale-or incrustation, and their dissolvin -effect upon scale already formed is minima ,This obviously is due to the fact thatrone .has not experimented to a sufficient degree to be able to substantiate which of the sub stances is especially suitable for separating the substances dissolved in the water and which of them is of such a nature that it will cooperate favourably with those constituents which prevent the separated substances from settlingas scale or incrnstations.

By the present invention I. have succeeded in manufacturing a purifying composition which, besides separating t 1 solved in the water, also prevents the said substances completely from settling as scale, and at the same time the advantage is obtained that the scale already existing is dissolved and sedimented.

e substances dis Application 111m April 10, um. Serial no. 101,205.

Experience has shown, namely, that the two well-known constituents of a boiler purifying composition, viz: caustic soda and calcined soda, cooperate especially well by using the well-known quebracho, for preventing the substances dissolved in the boiler water from settling upon parts within the boiler, and the alkali salts formed by "such cooperation will simultaneously have the effect of loosening and sedimenting old scale existing in the boiler.

By means of experiments carriedjon for a long time it has been discovered that the necessary and intended effect or combined action of the several constituents of the present scale irev'enting and re'movingcompositions is o tainedmore safely, by using the substances in the following pro ortions'. 25- 35 parts by weight of caustic so a, 7-10 parts by weight of sodium carbonate, 0, 81, 2

arts by weight of quebracho, which mixture 1s added to -130 parts by weight of water.

Claims 1. A purifying composition for COUIItBlH acting the formation of scale in boilers which consists of caustic soda,- sodium carbonate, and tiuebracho in a water solution.

2. urifying composition forcounter-acting the formation of scale in boilers and for removing existing incrustations consist-X ing of caustic soda, sodium carbonate, que.

bracho and water in the following proport tions: 2535 parts b weight of caustic soda,

7 1O parts by weig t of sodium carbonate,

0, 8-1, 2 parts by weight of querbracho, 80-

parts by weight of water.

In testimony whereof I atlix my signature.

HANS LILLEJORD. 

